Yes, Sir!

Noah now says "yes sir" to me when I ask him a question.  It's hilarious.

This morning he apparently also decided to say it to Abby.
Abby: "Do you want to do a puzzle?"
Noah: "Yes sir."
Abby: "No, I'm not a sir, I'm a maam.  Say yes maam.
Noah: "Yes maam."

A minute later:
Noah: "Yes sir."
Abby: "I'm not a sir, I'm a maam.  Say "yes sissy."
Noah: "Yes, sissy."
Abby: "Thank you."
Noah: "Yes sir."
Abby: "Noah!"

Two minutes later:
Abby: "Noah, do you want a braid in your hair?"
Noah: "Yes sir."